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Best practices for in-app database migration for Sqlite
... necessary to go from version 1 to version 2, then version 2 to version 3, etc... until it is up to date. An easy way to do this is to have a switch statement where each "case" statement updates the database by one version. You "switch" to the current database version, and the case statements fall...
SQL standard to escape column names?
... SQLite,
'foo' is an SQL string
"foo" is an SQL identifier (column/table/etc)
[foo] is an identifier in MS SQL
`foo` is an identifier in MySQL
For qualified names, the syntax is: "t"."foo" or [t].[foo], etc.
MySQL supports the standard "foo" when the ANSI_QUOTES option is enabled.
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Typedef function pointer?
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I guess I'm just confused about the ordering. With typedef int (*func)(int), I understand that func is an alias, just a little confused because the alias is tangled with the type. Going by typedef int INT as an example I would be more of ease if typedef functio...
Using module 'subprocess' with timeout
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I've modified your code a bit in order to be able to pass native Popen kwargs and put it on gist. It is now ready to use multi purpose; gist.github.com/1306188
– kirpit
Nov 9 '11 at 13:07
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What does “./” (dot slash) refer to in terms of an HTML file path location?
...der and ONLY the current folder. So if there is some kind of tool/compiler/etc that searches for the file, then './file' will search ONLY in current folder, whereas 'file' will search wherever the tool is configured to search (e.g. root, current folder, etc.)
– Marcel Toth
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Revert a range of commits in git
...nius. thanks. It hadn't occurred to me I need to revert commits in reverse order for the patches to apply, duh. This command shows the way.
– Tim Abell
May 15 '12 at 14:20
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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...ical: should the row names be in ascending (FALSE) or in descending (TRUE) order?
#' @param coldecreasing logical: should the col names be in ascending (FALSE) or in descending (TRUE) order?
#' @param default_value numeric: default value of matrix entries if no value exists in data.frame for the ent...
Practical uses for AtomicInteger
...two main uses of AtomicInteger:
As an atomic counter (incrementAndGet(), etc) that can be used by many threads concurrently
As a primitive that supports compare-and-swap instruction (compareAndSet()) to implement non-blocking algorithms.
Here is an example of non-blocking random number generator...
Tool to generate JSON schema from JSON data [closed]
...ema, that I can rework manually, adding things like description, required, etc, which can not be infered from the specific examples.
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Oracle “(+)” Operator
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Exactly right. In order to keep the (+) straight in my head (left side vs. right side), I like to think of the (+) as "adding NULL values if no match found". For example, "a.id=b.id(+)" means allow b.id to be NULL if there is no match with a....